Safety device for gas-burners.



L. W. G. FLYNT. SAFETY DEVICE PoR GAS BURNBRS. APPLICATION IILBD JUNE 26.71911.

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.To all whom tm/ay concern: *n Be it known that I, LOUIS G. FnYNT, "ja subject of the King of Great Britain, and

UNITED .STATES lPAJrENT oEEioE. l

LOUIS W. e. ELYNT, or ROCHESTER, NEW Yami, ASSieNoE To noMEsTIc'ArPLIANcEs coMPANY', 0E ROCHESTER,

SATETY DEVICE Fon eaS-EURNEEsf Specication of Letters Patent. original apiication ledaprilio, 1911, serial No. 620,113. Divided and this app'li'catiqn medium' 2s,

NEW YORK, A. CORPORATION QF YORK.

Patented May 28,

' 1911. SorialNo. 635,510/

resident of Rochester, in the county of Monroe and State ofl New York, haveinvented certain new and useful Improvements in Safety Devices for Gas-Burners'o which fthe following-.is a specification.

' rIyhis invention relates to steam-generators, gas-ovens, orother devices in` which gasburners are employed.

" Where a gas-burner is employed in an inclosed space for' heating purposes, as in a gas-oven, steam-generator, jor the like, a pilot-light is usually providedyin' order that the burner -may be lighted immediately when the gas is turned on. In 4case a pilot#l light is not so provided, however, or is not lighted before theA gas is admitted to thek burner, the unburnt gas issuing from the burner is liable to collect in the casing or oven andformvan explosive mixture, so that if it be attempted to light the burner a`dangerous explosion results. o

The object of the present invention is to prevent such explosions,- and to this end I v provide apparatus of the kind in question with means which operate automatically, when the gas is flowing from the burner, to prevent the .operator from lighting vthe burner or the contents of ,they casing-or oven, so"thatit is necessary either to light the pilot-light before turning on the gas, or

else to turn oi the gas before access can be had to the burner for the purposeof light ing the burner or the @pilot-light.

. In the drawings z-.hFigure 1 is a horizontal section, on the line -1-1 in Fig..2, of

a portion -of a steam-generator in connectionl with which the present invention is employed; Fig. 2 is a verticalsection on the line 2`2 1n Fig.. 1; and'Fig. 3 is a hori- A zontal section on the line A-A in Fig. 2.

v The inventionis .illustrated as embodied in a steam-generator of the type disclosed 1n my copendingapplication Serial No.,

620,113, 'filed April 1o, 19in-0f whichfthe present application is a division. s The burner is a hollow casting 3 provided at the top with slots for the escape of the gas and This burner is located at the bottom' air. of a cylindrical casing 4 inclosing the boiler which isheated by the burner. The casing f4 is provided at one .side with .a door-way -part of the ,present invention. The

`for the boiler is obtained.

which aiords access tol the burner and the pilot-light, and this door-way is normally closed by a door 5, depending from a pivot 6 by, which it is hinged to the casing. The burner is fed with' gas-A through a nozzle 7. Within the gas-nozzle is a steam-jet nozzle 8 which is employed toy inject the Y- gas, although this arrangement constitutes no asnozzle is supplied through a conduit 9 lnto. which the gas is admitted through an opening controlled by a gas-valve 10. The gasvalve moves in a chamber 11 "which is fed from a gas-supply pipe 12. The gas-valve 10 is automatically controlled by a diaphragm-mechanism described more fully .i-n' myv said application. To this endthe valve is mounted 'on' a stem 13 connected with a flexible diaphragm 14. At the left of the diaphragm is a chamber 15 which is in communication, through a tube .16, a T 17 and a tube 18, withthe boiler which is heated .by the burner 3, the diaphragm being thus subjected, on its .left-hand surface, to the boiler pressure. At the right of the,.dia phragm is a casing 19 which is connected,

-through a tube 20, with'a source of water under pressure from. which the feed-water y The resiliency of the diaphragm 14 tends normally to close the. gasvalve, thus interrupting the supply` of gas "to the burner;4 When the feed-water is introduced under pressure through the tube'20, however, the'pressure of the water acts to open the gas-valve and thus to admitgas to the burner. j

4 As the boiler is heated the boiler-.pressure communicated to the chamber 15 tends to 'counteract the. pressure ofthe feedewater upon the diaphragm, and the flow of gas is thus governed in the manner described in my said application. It will be noted that the gas-valve is never open except when there is pressure within the casing 19, and'l I take advantage of this actin operating an automatic device for locking the door 5 in closed position. To this vend a second diaphragm 23 is inclosed within the casing 19, and from this diaphragm a. rod 24.- extends horizontally intoengagement with the short end of a bell-crank lever 25. The

other arm of this lever engages a vertically.

sliding bolt 26, of which the upper end isadapted to engage an opening in a lug 27 on the door 5^.l A coiled spring 28, acting against a head von the lower end of the bolt 26, ltends to force the bolt downwardly so as to unlock" the door. As soon, however,

as feed-water is admitted to the casing 19V the diaphragm 23 is moved to the bright,

thus causing the bell-crank lever to raise the bolt into operative engagement with the fdoor. It is impossible thereafter to open the door until the water-pressure has been relieved, and accordingly the 4door cannot be opened while the gas-valve is held open by its diaphragm 14.

As it is inconvenient to lightthe burner directly, a pilot-light 29 is provided for this purpose, the pilot-light being fed with gas through a tube 30 which extends from the through the tube 20, thus opening the gasvalve 10, the gas flows into the burner, and is ignited from the pilot-light. From the diaphragm casing 19 the feed-water flows through an automatic controlling-device 21, which constitutes no part of the present invent-ion, and from this device the water Hows through a tube 18 to the-boiler. The pilot-light normally remains lighted even when the generator is out of operation, so that it is ordinarily necessary only to turn on the feed-water in order to start the burner. In case the pilot-light should go out, however, or be turned outfor any purpose, the operator of the generator be- 111g unware of this fact, or through carelessness, might first turn on the feed-water and admit gas to the burner, and then attempt to open the door to light the pilot-light. In

such a case the bolt 2,6 operates to lock the door, and before the door can be opened it is necessary to turn oif thefeed-water, and consequently the gas,- and also to wait for an interval of time during which the waterl which has accumulated under, pressure betweenthe diaphragms 14 and 23 4slowly escapes through the feed-water regulator into the generator. During this interval the gas which has been admitted to the casing has an opportunity to escape therefrom, so that when the pressure between the diaphragms is finally relieved and the doo1` is unlocked there is no further danger of explosion.

.I claim:

1. The combination of a combustion chamber, a gas burner therein, a gas valve for controlling the flow of gas through. the burner, a movable part that when in one position bars access to the burner to access to the burner for that purpose, and

unitary means for opening the gas valve and locking saidv part in the positionviirst mentioned whereby its movement to give access tothe burner is Aautomatically prevented after the gas valve is open.

2. The combination of a combustion chamber, a gas burner therein, a gas valve controlling thev flow of gas to the burner, a movable partthat when in one position bars access to the burner to light it and when in another position gives access to the burner for'that purpose, and automatic means adapted to operate with the opening of the gas valve to lock saidmovable part in the position first mentioned for preventing ignition of the burner.

3. The combination of a combustionchamber, a gas-burner therein, a gas-valve for controlling the flow of gas through the burner, a door aording access to the combustion-chamber to light the burner, and unitary means for opening the gas-valve and llocking the door in closed position, whereby opening of the door is automatically prevented after the gas-valve` has opened.

4. The combination of a combustion:

chamber, a gas burner therein, a gas valve controlling the admission of gas to the burner, a pilotlight for lighting the burner, a movable part that when in one position bars access to the pilot-light to light it, and when in another position gives access to the pilot-light for that purpose, and automatic means adapted to operate with the opening of the gas valve to lock said part in the position first mentioned for prevent'- ing ignition of the pilot-light when the gas valve is open.

5. The combination of a combustion chamber, a gas burner therein, a gas valve controlling the flow of gas to the burner, a movable part that when in one position bars access to the vburner to light it and when in another position gives access to the burner for that purpose, automatic means adapted to operate with the opening of the gas valve to lock said movable part in the position first mentioned for preventing ignition of the burner, and means for ret-arding the return of the lock to its unlocking position after the gas has been turned off.

6. The combination with a source of supply of Water under pressure, and a source of fuel supply, of a boiler; a burner for heating the boiler; connections between the burner and the source of fuel supply including a fuel-valve for controlling the admission of fuel to the burner; a valve-actuator connected with and controlling the fuelvalve; connections between the fuel-valveactuator and the source of supply of water, whereby the valve-actuator may be subjected -actuator and the fuel-valveiactuator may be simultaneously operated by the water-presisure; substantially as shown and vdescrlbed.

7 The combination, with asource of supply of water under pressure, and a Wsource of fuel-supply, of a boiler; a burner forv heating the boiler; connections between the burner and the source of fuel-supply including a fuel-valve for controlling the admission yof fuel Vto the burner; a valveactuator connected with and controlling the.

fuel-valve; connections between the f fuelvalve-actuator and the source of supply of water, whereby the valve-actuator may be subjected to the water-pressure to open the fuel-valve and admit fuel to the burner; a combustion-chamber having a door that. gives access to the burner; a lock for the l door; a diaphragm operatively connected with the lock; and connections between the diaphragm and the source'of water-supply whereby the lock-actuator and the fuelvalve-actuator may be simultaneously operated by the water-pressure; substantially as shown and described, v v

8. The combination, with a source of supply of water'under pressure,'and a sourceof fuel-supply, of a boiler; a burner for heating the boiler; connections between the burner and the source of fuel-supply including a fuel-valve for controllingthe admission of fuel to the burner; a valveactuator connected with'land controlling the fuel-valve; connections between the fuelvalve-actuatorand the source of supply of bustion-chamber having a door that gives' adapted water, whereby thevalve-actuator may be subjected to the water-pressure to open the bustion-chamber having a' door that gives access to the burner; a lock for the door adapted to assume automatically the unlocking position; a lock-actuator operable by water-pressure from the source of supply `valve` and admit fuel to the burner; a comto holdv the lock in engagement with the door; tand means for admit-ting waterpressure simultaneously tothe lock-actuator and the fuel-valve-actuator; substantially as' shown and described.,

9. The combination, with a source of supply of water under pressure, and a source lof fuel-supply, of a boiler; a burner for heating the boiler; 'onnections'between the burner and the source of fuel-supply including a fuel-valve for vcont-rolling the admission of fuel to the burner; a valveactuator connected with `and controlling the fuel-valve; connections between thev fuelvalve-actuator and the source of supply of water, whereby the valve-actuator may be subjected to the water-pressure to open the valve and admit fuel tothe burner; a comaccess tov the burner; -a lock for the doof" to assume"automatically the un:

locking position; a lock-actuator operable by waterpressure from the source of supply to hold the 10pk in engagement with the door; means for admitting water-pressure simultaneously to the lock-actuator and the fuel-valve-actuator; and means for retarding the return ofthe lock toits unlockingposition after thegas has been turned off;

substantially asshown anddescribed.

LOUIS FLYNT.

Witnesses:

C. S.`DAv1s, yD. GURNEE. y 

